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25 lines
581 B
Go
25 lines
581 B
Go
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// +buid linux freebsd
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package fs
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import (
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"os"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"golang.org/x/sys/unix"
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)
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// MustFadviseSequentialRead hints the OS that f is read mostly sequentially.
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//
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// if prefetch is set, then the OS is hinted to prefetch f data.
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func MustFadviseSequentialRead(f *os.File, prefetch bool) {
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fd := int(f.Fd())
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mode := unix.FADV_SEQUENTIAL
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if prefetch {
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mode |= unix.FADV_WILLNEED
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}
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if err := unix.Fadvise(int(fd), 0, 0, mode); err != nil {
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logger.Panicf("FATAL: error returned from unix.Fadvise(%d): %s", mode, err)
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}
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}
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